Using runwithelivatedprivilages and using delegates

SPSecurity.RunWithElevatedPrivileges(delegate()  

         {  

             using (SPSite site = new SPSite(SPContext.Current.Site.Url))  

             {  

                 using (SPWeb web = site.OpenWeb())  

                 {  

                     SPList LstPicture = web.Lists["......"];  

                         

                     foreach (SPListItem item in LstPicture.Items)    

                     {  

                              

                         LstPicture .Add(textbox.text);  

                     }  LstPicture .update();     

                                      }  

             }  

         });  

 }